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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-6843) Entries in the FileSystem's Cache could be cleared when they are not used
Date Sat, 26 Jun 2010 01:56:50 GMT
Entries in the FileSystem's Cache could be cleared when they are not used
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                 Key: HADOOP-6843
                 URL: https://issues.apache.org/jira/browse/HADOOP-6843
             Project: Hadoop Common
          Issue Type: Bug
            Reporter: Devaraj Das
             Fix For: 0.22.0


In FileSystem, there is a cache maintained for Filesystem instances. The entries in the cache
are cleared only when explicit FileSystem.close is invoked. Applications are not careful on
this aspect. Typically, they do FileSystem.get(), operate on the FileSystem, and then they
just forget about it. Every FileSystem instance stores a reference to the Configuration object
that it was created with. Over a period of time, as the cache grows, this can lead to OOM
(we have seen this happening in our hadoop 20S clusters at Yahoo).

This jira aims at addressing the above issue.

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